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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20bbb4bf517c633562b81a06f5bfde893388b5d33b8fcf78907d663818820b6' 
  AND token = '6g/e1XXir5w5VWjTcBJ7PQ2Lyinxd5TD0siGQw5hR3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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