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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cce609c2e01117692304ebe66aa4815c27c819e19d145f679a8472523d85fb78' 
  AND token = 'drDoonhDXkVkBVaqcn3gylG+qIZ45RjK7k8KAuUmIRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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