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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a5d90e11a3f04a8135abde84db9c5dd7364473940e4767f62bfa6c1aa58ccf4' 
  AND token = 'b6dCi9wV6J+fwUGDwSri9EbgBzfNQIDLJ9yHuJdz5Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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