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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e18298bb26eb509b42be68210f67e4f5c56707af027c19dfdbec04e82e69519' 
  AND token = '9dUj4YQtIJdfWGNmMfSceKZEna/ORk0geQ6tRCe8kWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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