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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892cb96e39c1d154a52f5ec0299b906273b9b8c5a00453cdf5e7ed32ef23a1cc' 
  AND token = 'zyDQYERdVDO3nOCgLatNGXwX4bNXkcqZNVoz027gONc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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