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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5602ad2c4cfd1328507bd39ebed21e3f110baa0e1a33ed594d390e0d59bb09e' 
  AND token = 'l7nRklhnKlcJc31E86m3J6ZdX1nSZXtEkHSUje7ITjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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