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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75fe199fe6b374ee76c447820c893446a6d35d7e25ab85ac75d787cf92d9347' 
  AND token = 'XP/fczIEpUOCESsWZfTB0odHJbLzP6eWB2Ve2ewi8oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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