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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37c20ee60f80b5495f62c79d031a45b420f20631527e61c4a5a8c26a26bce551' 
  AND token = 'ng3+hiTw2jCXLZwx1Eb1xPOwyjUHPpnFe1UGJ7ODBf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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