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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb821ef3efd907f3fd9b92fa52c3e1dbed2c9f05c17aadeb90f399a818d0c03' 
  AND token = 'ew3pekg24PM5N03E7vtxt0OPnziblRdCQv2zxYHbU9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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