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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c8502d0c164e527d1ce81cfb4ce4c5a4c4a5a4f139430c74fe4d4d22e8817d' 
  AND token = '9QLt8RJN+t71jsIVeLFMGSFTTHjJ8h7NVzdrSqHaqHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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