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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a2f0f651f79ad0b1a14b6e97acd4170d7733f4588d982fa2e47cbc368c0d60c' 
  AND token = '9KHTMnlfG14ipYpsNIGVvlxZoXTMkVx93ceCTT0JHKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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