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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43277f595a791bfc4fcc9cb6dbc2cfb8a0c9f44ebacbc921360183b1843cf591' 
  AND token = '7YVxqvDl7XiuRKyxToFPv6IBPO4QbXM1uw4hJ3LQk0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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