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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a8bc75f2614bd09204af21fbcea489dff556d31456f4f98d310d2673cc1e53' 
  AND token = 'avIzhWw5R4uMZcB7LuKZRl6ero1A8HEaHun/lwW8zto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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