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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bde65377150cd3acc99d94d74e94856795ffb7392235e869d2741f79777046a' 
  AND token = '7dBp4HziEQg+riJKYvxWAPpntvnpET6ARm6hPrAJYYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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