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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21fe3887d380b82543d29d7edd6d4add4c0799307beae857e54d31e9386f98d7' 
  AND token = 'JC9Rx4sOXeyj4ink4G7G45jsi0fTq3+PJm0jwgmFP8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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