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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf5dad1b4480fd737ed6971dc4da0bfc83c1eeb95b41ab530810e8bdf8066e98' 
  AND token = 'C2dmT567KWxq0LcWXIuF6jpd5kuuqiO3UyD1SjWgzuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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