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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e61322db5ee70fd71dbbda3ce2db1b19602eeaa7b580a1690ad5baf20ca74b35' 
  AND token = 'qL++XOzIvD+vdK2UUvaStdJCQ2ymZyht2JZXHeeEcYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01069

JSON explain

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