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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd8ceacdc6ff5e3f92f4a8aea93b03b4084fb42d4b82d145e6800fc75f35b0a' 
  AND token = 'qDUDn7VwuIqCws2Js+a3Qbf+lgVlW/P9BS18D8nuDbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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