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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9466fe127dde2b1285b95c659f253e516e92d99893c8a0510354fc524871d3d' 
  AND token = 'Q9RdNl+xAy+8lK/1dq04krOKfUloN50bs3rn/2Ubi64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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