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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79519cc403dd43fb62d9627d9d19fa297a6d508d2f8fa24f427cce9335e54131' 
  AND token = 'rauD1uQElyZ3KKD4OxymzLBwmMoT5Wx/EbSzkyPCkzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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