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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f683cf3005f1c0a8bc17b8172103e51e7546ef38cfae21e74d45ffad101226' 
  AND token = 'wxrJkcXvkSFbu/cROnoI6kw1ujN0aVz67YKvRaBb2UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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