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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8e8b94486bba5f5723391a75a00a00afd30b7f760b8cca3c0d7142ebab7def' 
  AND token = 'D9ve8trEdLVzE/Nj9wWkW/hGbEnwcFydY6Sow5Dsexs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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