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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8cbf6de68cb6feddb25e9bab6fdc5ac9801df46a9caf14c4fcca2e6a696d0e' 
  AND token = 'wiNKm4kQ05ToYf0kmMgfdMWgRC7oq5RXTTBeX3vrr5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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