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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a342df9b172a000a46e9b73d8585bf754c5df99f2ed8ed28f73c89fca4bf25f' 
  AND token = 'Qsk32xePUviLpMhnXyIri2rp5TcWnrHE54OU5irCWGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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