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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e48b7d9d854a8893ed22d65bafcfc77867cd5c7df667eea2f5ffec9d3d9c7e' 
  AND token = 'wJTVnoVA9Zh6YbLNlJlKwagpQfg14nluT7jNNPmeCaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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