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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '114a011839139065bc36585adc24791b64c399ca7ec4b5a7682989d469288968' 
  AND token = '7gRgdaMiSHnbTeQjsItM9c8DewgcCxKn6FLeCeu4Qtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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