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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82d08a7cba4c6e7590b9ab94d552fc5c212f73b3410a12df9c3104bdbebb5186' 
  AND token = 'IplRfZh8zkA8SMx9+T6kxTVFyagf8iv63CqbAs3x65Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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