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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afbb6b0c3cc4d6877faba2551b3139579957d85f9b80b3e6e91f2b65cb30326' 
  AND token = 'FnrQfHacEv2Ejj49oG9BoVLdLauphvKd7IIJgtP1l0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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