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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fea52a0a1f8957d26a90a9158a49c1b65bcc9975955008d88a9c443ef358e56' 
  AND token = 'Y6e2ddCkk7BNafSlLRC1Nvr+J4uTr//PLFCeR+j0h3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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