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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ddabf8eaa041ca8dcb6f2b1700ec6e10d804d3da0edaa7c8260b44b9508b24c' 
  AND token = 'K1bN7lBBReVfS8EPdrh3u++ew2/w15wrPvx4YpX0cr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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