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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073678828ad9a17a4991c4e2cf4680d1b0e3edf351c8af4e552a0683414f7144' 
  AND token = 'do4Jk8QhunQcTVdxfWY5Tg4QYJDiaaZv4H4AItUEj1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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