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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5db5d6afe9c8e9d3d8162e036dedb84b6cdd2cbf5608537307accf7ed4e5e5e9' 
  AND token = 'KfkDzjf/z3ZX2XX++o+eW6Di1sotC8b4wM40hbNT0Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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