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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddac622f7a5a1862af7dad24aeab707a566b4a94b9c66813e41e720a35aa1d8a' 
  AND token = '6Oyfa3/mRb8tXoYNK1eeuzaZM6Z+P4r2ZclPREUxL58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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