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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb933219abe4b318be8fe814c184258060fdc0bfc6e612e16dfef97d8e67df3' 
  AND token = 'r4OmTqMfN5s2WHnFNw4OpZKE5Fkl59TBN8fg5oPW59g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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