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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624d23512ec7581c69853b33f99718b6a2f26d5867553fec1c70f1141612e052' 
  AND token = 'OdVCHnAB4nTiMSz/qUMGM5okGgItk4jgKa2maTn3y0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}