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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff8c9eb4f982c4bb438fb1f12d0a9e9e442b3c0dd445ce9fe340cd5771db070' 
  AND token = 'xrhVB+akuc9LMQ65eK7B1h32ADZBgmygZvu74Ej87P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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