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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d169756c338539418b4d9cdc01167ec14bde5db9244ec0813b6450c093c3f72' 
  AND token = 'GQaAI7Js4EPxO7dUMmeAZFRjgw4kNqZpIZ0DBHViB2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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