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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fde77daffb96b6ca3a23d19707b9d500446377967384e4969230f4657de86c3' 
  AND token = 'E9Y0iM7ZDvpmUYk2jzET7O3am762AbNKJCTw1Rmveic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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