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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4dc5c4f676524ca7066a52be633492fde665c4ee18996dc65672ce959e82c0' 
  AND token = 'nE3ptnHnTqtfY0UyfZXSfRKUIV2sAyjj7Nddf5YxEpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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