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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '132f4060d7fc1b872df348dce6b63191b5315a2dfec53eb0e2711b13c4920580' 
  AND token = '9NVcapO8Cu4299s65Igmu0qHJqVvzkbHu/+sn8IH3y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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