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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d7b51a0ceef2396291efbe4c00790438c7d7736270b24bf91641b238c890e5' 
  AND token = 'sVzHVZTJr1r+Ae4JH1UrwT+EL7IwMXTxt7i/fpa3ihc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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