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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2109795f49e7340062e5dd76547fc975b0ad1fd65710a1898171fb760f9d35a8' 
  AND token = 'CiLhzprV2b2KW2ZC9SbaaxJgJNG2rvTTG35Er05J6zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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