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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5045797a284458d0ba254a66d6f212742dc86bf3ad17bdbb59237c5958653460' 
  AND token = 'YewH6K7aqf0PUGo3uO1mu8hL+7Kq869xdpw2lORWToo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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