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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a59fa24402d0a41c732b7e7a27db26df23a08861b5665e2775b3cf1e772d7c97' 
  AND token = '4fSZGO3N9BEiwA9OD59MYmTmNv5uLbHntigF3zf3sNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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