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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fe52621142b83ae5c87d1cbe832a5ad6bec1ebbcef35bfc407471ab6ce5b3ba' 
  AND token = '8nusSm1OR7eZ2jXRjstEONrO8PxOf5gKMErlgGxWTM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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