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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085a1f97f781a9cc68b1cb858ae22411294973fdeff00109d865537b30e7a5fa' 
  AND token = 'u3ZTJCK7YQp8lQ0kzbVaT/k1ROuWtmPSMA6nJbAsXFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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