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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92523c0a79a8166d58149b2da7b6589e13df7ddcb9d653e969f58c0f5e38ea7' 
  AND token = 'gTon+4NaWYL7yaz8nHQ9Ich+NTnd0Ze1S8zNPw8HWjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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