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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd91738b1ec6710da01ca8374556ae1c45671df1e32d7a2a3d65ba8f4dfc88bf8' 
  AND token = 'Z307yW+mANxXuj0S8pixhBbCAq4T4qf2aBiBmz9lv0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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