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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7798d19e417c782ce54e9b43b29d988aaf41a20c7d9134fb86d078c4ff98c854' 
  AND token = 'YmDWmgbzjCziJbO7glIi2h8YHbFWY1gOlZzAKhxUTkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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