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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bedc6f52cfb2e227a6b4ddd7d9edcbe0aa1101ee08ca7ffa1db53f9b7d9de4' 
  AND token = 'v4hBKcJJGFCnhXAk46ZLVDCtbGjR9FUEZwtl2a4e0xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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