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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2692201bd0eb1da73557f1b5c5a11c000847d9e71789059d28c4a9545efedb9' 
  AND token = 'ndOyG7MbyTKnhOcEx9nBe9dv1RDhWbfoz3H4uWLYX08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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