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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34df8ba17a50381213336280e68d3dbd30e4bc0d21ca0fb53a5e7bdab3acf11' 
  AND token = 'Eb3tGzlJjNUh11f35xqCT6mhzsWvIOzbpNppkZT2J3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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