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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e37f9416cc0a0682f72be4af8e2d2063fb7ec65a56bf7eef3ddf67aa8f0e493d' 
  AND token = 'aqj8L7/z0jx2btissfE1j1K1F0RQG8CLKoQIM/HJ6hI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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