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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e555ef2ddc1978d583aa54b9e6ae50273668ab0e7cf31c63231a2fd07e275bfc' 
  AND token = 'fY6QVpJb3Bq0PTpvqHabeTp9AHSuvk7NBOk8BOAaQB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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