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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a3bc920f52e4cddef69d2e4f7d2a23c658772b4fbc20ee11c248e22730b6c8' 
  AND token = 'wghr8UtnfX1FAhknEsKoUB1rsdGFavP/5J9ohpayBfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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