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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cabf10d4102adac8b0c3cdc0e6f34644117973a126f552c8412f6bc5edebcab' 
  AND token = 'BTCo8eBEXsELE9uOyp/N2M/cyW1cN8u5AAXadQJBobs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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