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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca21055264bc619de3e5f25d4255913c49a14175e43b6a29ec365793648504a1' 
  AND token = '7E0MiJzme7Ll1+qp6NgHMjNrczrEJBERf/WfT0zX7zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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