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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0c894b0b0df9c4186890b3c49d956c36c3d4f4e8968fcea2e6f91ee727ca95' 
  AND token = 'qJlZ17VHmFqhamybGqrxdKpiOT+6HANcf7eWXVNEMVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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