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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c85f0c7833c4fde214754b96845769c1e4f63621ba8779eec8f4c71392c741b' 
  AND token = '0n1wknuC36rqo7fev/pjH0ZIyQWSCShZO4tMbUPP610=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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