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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '909912104bda474034c0c39bd8271fa8e2953c76b96c3a3a81d4b10eaa76a752' 
  AND token = 'PdarzgJTGGMGtyEG95hBSI5pZt2OrFVwUK4ta9N4J80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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