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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1b6d63c0b678c19b506884a4ce8b3db6dfc438d9408e48ed5f454245512bd8a' 
  AND token = 'KTAH75KrJo49WlmV90Ksc8Q1XNPIURLPFzXPHTgYv5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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