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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '304fafbd654f64d4d29ed178dff5a070e404e8c0c382c03ef2868e8f6275fa5a' 
  AND token = 'bHTlcDzrFJV2IZj+Qg/xhBDPpXFePyzxFNNwpdpEA8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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